- 专利标题: Oil free screw compressor
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申请号: US13192592申请日: 2011-07-28
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公开(公告)号: US08651839B2公开(公告)日: 2014-02-18
- 发明人: Hideki Fujimoto , Hitoshi Nishimura
- 申请人: Hideki Fujimoto , Hitoshi Nishimura
- 申请人地址: JP Tokyo
- 专利权人: Hitachi Industrial Equipment Systems Co., Ltd.
- 当前专利权人: Hitachi Industrial Equipment Systems Co., Ltd.
- 当前专利权人地址: JP Tokyo
- 代理机构: Crowell & Moring LLP
- 优先权: JP2010-287769 20101224
- 主分类号: F04B23/00
- IPC分类号: F04B23/00
摘要:
A multi-stage oil-free screw compressor includes: a suction throttle valve for controlling air intake into the compressor; a piston assembly for operating the suction throttle valve; and a structure for supplying a working pressure to the piston assembly. In order to reduce startup load at the time of startup of the compressor, the suction throttle valve is fully closed while a secondary side of a compressor body is opened to the atmosphere. When a negative pressure and the air pressure, that provide the working pressure, are used for slightly opening the suction throttle valve in order to switch the compressor to a loaded mode after a motor for driving the compressor is accelerated to its top speed, the air pressure is provided by a control pipe line that is defined by the same pipe line that forms a drain pipe line. This permits the control pipe line to be opened to the atmosphere as needed during the startup time. Thus is provided the oil-free screw compressor achieving improved startup reliability.
公开/授权文献
- US08696335B2 Oil free screw compressor 公开/授权日:2014-04-15